题目内容：

语法填空

1.You look unhappy. What about _______ (have) a walk with me?

2.Do you learn English by _________(ask) friends for help?

3.His sister is ________(afraid) of the dark.

4.When I was a child, I used ________ (go) out for a picnic（野餐）.

5.When students do homework with friends, they talk instead of _____(do) homework.